Pirate 4x4 banner
1 - 17 of 17 Posts

·
Registered
Joined
·
137 Posts
Discussion Starter · #1 ·
I was at the wrecking yard the other day and saw what appeared to be a complete propane powered. Dose any body know anything about these?
 

·
Premium Member
Joined
·
4,400 Posts
Originally posted by Pizzacutter:
<STRONG>I was at the wrecking yard the other day and saw what appeared to be a complete propane powered. Dose any body know anything about these?</STRONG>
I used to run a propane powered FJ-55. Is it dual fuel or propane only? Only difference to a gas engine is the vaporizer/pressure regulator. Works well, runs very clean, 50,000 miles on an oil change and the oil will still look clean. Very high octane-equivalent, so it works great in high compression engines.
 

·
Registered
Joined
·
220 Posts
so what's the down side, i mean...there's got to be something or you'd see a lot more of them on the trail. so...spill the beans.
 

·
Registered
Joined
·
137 Posts
Discussion Starter · #4 ·
as fro dual fuel i am not sure didn't look that close, saw a kind of capped manifold, with a like half inch hose running to it, I was looking for the holy grail ( ac bracket that mounts low on pass side of the block, fund one <IMG SRC="smilies/tongue.gif" border="0"> )So i was kind of in a hurry. is it worth anything?
 

·
Premium Member
Joined
·
4,400 Posts
Originally posted by Cobb:
<STRONG>so what's the down side, i mean...there's got to be something or you'd see a lot more of them on the trail. so...spill the beans.</STRONG>
MPG is about 60% of gas, less BTUs per gallon (I used to get 10 MPG with my FJ, stock F engine highway or city was the same). Power can be less or more, depends on how the engine is set up. Ideally 11-12:1 compression, and other tweaks from gasoline operation (at least if running propane only). Bulky tanks, I had a 1 single and one dual tank in my FJ, 50 gallons total, about 500 mile range. Sometimes hard to find propane "motor fuel" (not bottle gas). Often you can buy bottle gas (technically not legal) for motor vehicle use, but you'll pay for it. Motor fuel has road taxes added and is usually fairly inexpensive. If you go cross-country with propane, invest in a propane station directory, you'll need it.

Get to -40F and propane freezes, pretty hard to start at even -20F. Popular with fleet vehicles where engine maint. can add up. At one time LPG-only was exempt from smog in CA, but that changed about 10 years ago. That's why I no longer have my FJ, couldn't find anyplace that would smog it when they changed the "rules".

My dad has been running 2 vehicles on propane, a Chevy pickup has been on LPG since 1973, original 350-V8 engine, it once threw a timing chain about 10 yrs. ago, they pulled the heads and no wear, not even the valves, they just threw a new head gasket on and bolted it back up. He also runs a Dodge w/ 440-V8 that's on dual fuel, helps the high compression engine handle the bad gas nowadays. Its been dual fuel since about 1980 or so.
 

·
Premium Member
Joined
·
4,400 Posts
Originally posted by Pizzacutter:
<STRONG>as fro dual fuel i am not sure didn't look that close, saw a kind of capped manifold, with a like half inch hose running to it, I was looking for the holy grail ( ac bracket that mounts low on pass side of the block, fund one <IMG SRC="smilies/tongue.gif" border="0"> )So i was kind of in a hurry. is it worth anything?</STRONG>
The 1/2" hose is the vapor feed pipe. Conversion parts and install generally runs $1500 plus tanks.
 

·
Registered
Joined
·
137 Posts
Discussion Starter · #7 ·
well i don't need it but i am going to buy it, Should i take everything all the hoses tanks and what not? or leave the tanks are they important?
 

·
savage
Joined
·
1,973 Posts
. Its been dual fuel since about 1980 or so.
how hard is it to Dual-fuel something? can you just pipe it into the air cleaner and shut off the fuel supply to the carb somehow or is it something you'd need a kit for? Reason I ask is I've thought about this before, the propane would still run almost upside down. The carb sucks a$$ when the vehicle is at any kind of an angle. You could switch back to gas on the road and not have to worry about finding propane out in the boonies.
 

·
Registered
Joined
·
1,988 Posts
Seems like there's a difference in the carb too. Propane/CNG systems would need a presurized carb where normal carbs are vented to atmosphere. Duel fuel refers usually to Diesel systems that are using 2 fuels at once where a switchable system is a Bi-fuel system.
 

·
Premium Member
Joined
·
4,400 Posts
Originally posted by scottz:
<STRONG>
. Its been dual fuel since about 1980 or so.
how hard is it to Dual-fuel something? can you just pipe it into the air cleaner and shut off the fuel supply to the carb somehow or is it something you'd need a kit for? Reason I ask is I've thought about this before, the propane would still run almost upside down. The carb sucks a$$ when the vehicle is at any kind of an angle. You could switch back to gas on the road and not have to worry about finding propane out in the boonies.</STRONG>
Where is usually just an adapter plate added to the carb for the LPG injection. You end up with a switch to change between fuels and can run on either. I had it added to the Holley carb on my Landcruiser. It sure ran nice, that old F motor used to stumble and took 10 minutes to warm up before you could think about getting on the freeway. With LPG, it was smooth from the start, you could set the idle down to near zero it was so smooth.

Best bet is to find a local propane dealer that does conversions, but here's some info on the web:

LPG info
 

·
Registered
Joined
·
704 Posts
That 22R will be a real Dog unless you raise
the compression ratio, and you will need a
tank that take up your whole bed to drive
very far. But it would be great on inclines.
A 22RE might be a better choice.just my 2c. <IMG SRC="smilies/usa.gif" border="0">
 

·
Premium Member
Joined
·
4,400 Posts
Originally posted by Domenic:
<STRONG>That 22R will be a real Dog unless you raise
the compression ratio, and you will need a
tank that take up your whole bed to drive
very far. But it would be great on inclines.
A 22RE might be a better choice.just my 2c. <IMG SRC="smilies/usa.gif" border="0"></STRONG>
That would help, but I found my old F engine in my FJ55 was a lot peppier on propane than on gas. Low end torque was a lot better, I found no loss of power, in fact it may have been better. The F engine runs in the 7:1 compression ratio range. Upping the compression certainly would help and yes the tanks are bulky.
 

·
Registered
Joined
·
363 Posts
Wow I can't believe all the myths that I'm reading.I have run several vehicles on propane and have had no problems.Sorry man 50000 miles between oil changes is total B.S.you still have to change the oil just as often.The oil breaks down just as quick it just doesn't have the carbon content from the gasoline that darkens it.I don't recommend dual fuel unless your religious about running the first five minutes on gas then switch over and the opposite for parking at night.Eventually if you leave it on propane the carb gaskets dry out because in order to run on propane you shut off the fuel supply then just as it begins to stumble you switch over.This leaves the carb dry and the gaskets don't like this.There are many ways to get more power than gas if you are rebuilding the engine.If you do rebuild you will need to install special rings if you are dedicated LPG to allow for proper break in or run gas for the first 10000 miles.The system you looked at what was the make OHG,Impco,Vialle or possibly one of the other suppliers.Depending how old the system is you may have to run different lines and get auto shut off valves installed in the tank instead of the bleed off system.Compression is an old school of thought for propane but if you are building it a little extra doesn't hurt.If you want info on the conversions look to Canadian sources as there are huge numbers of suppliers and installers up here.I have a few systems around and when I put my 22r in my sammy it will be on LPG because I already have the stuff.Sorry to wander all over here but if you are going to post info at least know your shit.I don't know jack about a lotta stuff and could know a lot more about LPG but I do have a fairly good idea of what I'm talking about.BTW it's -47 that LPG goes from a gas at atmospheric conditions to a liquid.It doesn't freeze it just doesn't vapourize therefore there is no pressure to make it run.One degree higher and there is no problem.When it gets colder than that WTF are you doing out anyway.But seriously even that cold is not a problem as you can install tank blankets that electrically heat the tanks.Whatever you decide LPG is a great set up.I would however check availability in your area and cost effectiveness.Your 22r will run smoother than it ever has and will idle upside down till it seizes. <IMG SRC="smilies/tongue.gif" border="0"> <IMG SRC="smilies/rolleyes.gif" border="0"> <IMG SRC="smilies/jeep1.gif" border="0">
 

·
Registered
Joined
·
134 Posts
Dual Fuel

I plan on converting to dual fuel, I have a set up off a 72' chevy 350 the guy who owned the truck warned that the previous owner had "blew the carb of the truck" by running gas & swiching the pane on before the gasoline had fully burned off. I know this seems dumb but it got me thinking a little, and I would want to know that before attaching somthing from a junk yard & learning the hard way. Any one else heard of this happening on duel fuel systems & anyone know the safe way to switch fuels say as the truck is stationary, I was told simply to "get on the freeway switch the gas off let it burn off & flip on the LP coasting @ 40+ mph & it fires right up". can anyone with a better explanation post? Thanx. :skull:
 
1 - 17 of 17 Posts
Top